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Fencer Vulns
medium 5.3

CVE-2020-7693 json

Denial of Service (DoS)

published 2020-07-09 6 y ago modified 2026-06-17 4 mo ago also GHSA-c9g6-9335-x697 , EUVD-2021-0811

cvss
5.3
version 3.1, CNA
cisa kev
Not listed
not in CISA's catalog
epss
5.0%
EPSS 5.0% chance of exploitation in 30 days, percentile 92%
public exploits
0
none known

Summary

Incorrect handling of Upgrade header with the value websocket leads in crashing of containers hosting sockjs apps. This affects the package sockjs before 0.3.20.

Patch / fix

  • npm sockjs 0.3.20
  • n/a sockjs 0.3.20

Vendor advisories

What the vendors themselves say about their products: affected, fixed or not affected, and what to do.

red hat product security vex CVE-2020-7693 updated cvss 5.3

npmjs-sockjs: incorrect handling of upgrade header with the value websocket leads to DoS

  • Red Hat OpenShift Container Platform 4 openshift4/ose-prometheus
    affected: workaround, no fix available “There is no mitigation for this issue, the flaw can only be resolved by applying updates.”

Red Hat CSAF VEX © Red Hat, Inc., from https://security.access.redhat.com/data/csaf/v2/vex/; changed: reduced to product statuses and remediations. CC BY 4.0 · csaf

Exploit prediction

4.98% chance of exploitation in the next 30 days, higher than 92% of all scored CVEs (FIRST EPSS, 2026-11-08).

Exploits and checks

  • github.com https://github.com/sockjs/sockjs-node/issues/252 referenced PoC, tagged "exploit" by a source, unverified
  • snyk.io https://snyk.io/vuln/SNYK-JS-SOCKJS-575261 referenced PoC, tagged "exploit" by a source, unverified
  • snyk.io https://snyk.io/vuln/SNYK-JAVA-ORGWEBJARSNPM-575448 referenced PoC, tagged "exploit" by a source, unverified
  • github.com https://github.com/andsnw/sockjs-dos-py referenced PoC, tagged "exploit" by a source, unverified

CVSS scores

assigned by version score vector
CNA 3.1 5.3 CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:L/E:P/RL:O
CNA 3.1 5.3 CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:L
NVD 3.1 5.3 CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:L
NVD 2.0 5.0 AV:N/AC:L/Au:N/C:N/I:N/A:P
GitHub 3.1 5.3 CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:L

Affected packages

ecosystem package affected fixed in
npm sockjs
<0.3.20
0.3.20

Affected products

  • n/a sockjs

Classification

Weakness
  • CWE-755 Improper Handling of Exceptional Conditions
  • CWE-20 Improper Input Validation

References

Sources

Fencer Vulns keeps one entry per vulnerability: the CVE id wins, then GHSA, and records that alias each other are merged, except that two CVEs always keep separate entries. The same data is available as JSON.